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<div class="titlepage"><div><div><h2 class="title">
<a name="zend.config"></a>Chapter 5. Zend_Config</h2></div></div></div>
<div class="toc">
<p><b>Table of Contents</b></p>
<dl>
<dt><span class="sect1"><a href="zend.config.html#zend.config.introduction">5.1. Introduction</a></span></dt>
<dt><span class="sect1"><a href="zend.config.theory_of_operation.html">5.2. Theory of Operation</a></span></dt>
<dt><span class="sect1"><a href="zend.config.adapters.ini.html">5.3. Zend_Config_Ini</a></span></dt>
<dt><span class="sect1"><a href="zend.config.adapters.xml.html">5.4. Zend_Config_Xml</a></span></dt>
</dl>
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<div class="sect1" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="zend.config.introduction"></a>5.1. Introduction</h2></div></div></div>
<p>
        <code class="code">Zend_Config</code> is designed to simplify access to and use of configuration data within applications.
        It provides a nested object property based user interface for accessing such configuration data within
        application code. The configuration data may come from a variety of media supporting hierarchical data storage.
        Currently <code class="code">Zend_Config</code> provides adapters for configuration data that are stored in text files with
        <a href="zend.config.adapters.ini.html" title="5.3. Zend_Config_Ini"><code class="code">Zend_Config_Ini</code></a> and
        <a href="zend.config.adapters.xml.html" title="5.4. Zend_Config_Xml"><code class="code">Zend_Config_Xml</code></a>.
    </p>
<div class="example">
<a name="zend.config.introduction.example.using"></a><p class="title"><b>Example 5.1. Using Zend_Config Per Se</b></p>
<div class="example-contents">
<p>
            Normally it is expected that users would use one of the adapter classes such as
            <a href="zend.config.adapters.ini.html" title="5.3. Zend_Config_Ini"><code class="code">Zend_Config_Ini</code></a> or
            <a href="zend.config.adapters.xml.html" title="5.4. Zend_Config_Xml"><code class="code">Zend_Config_Xml</code></a>, but if configuration data are
            available in a PHP array, one may simply pass the data to the <code class="code">Zend_Config</code> constructor in order
            to utilize a simple object-oriented interface:
        </p>
<pre class="programlisting">&lt;?php
// Given an array of configuration data
$configArray = array(
    'webhost'  =&gt; 'www.example.com',
    'database' =&gt; array(
        'adapter' =&gt; 'pdo_mysql',
        'params'  =&gt; array(
            'host'     =&gt; 'db.example.com',
            'username' =&gt; 'dbuser',
            'password' =&gt; 'secret',
            'dbname'   =&gt; 'mydatabase'
        )
    )
);

// Create the object-oriented wrapper upon the configuration data
require_once 'Zend/Config.php';
$config = new Zend_Config($configArray);

// Print a configuration datum (results in 'www.example.com')
echo $config-&gt;webhost;

// Use the configuration data to connect to the database
$db = Zend_Db::factory($config-&gt;database-&gt;adapter,
                       $config-&gt;database-&gt;params-&gt;toArray());

// Alternative usage: simply pass the Zend_Config object.
// The Zend_Db factory knows how to interpret it.
$db = Zend_Db::factory($config-&gt;database);
        </pre>
</div>
</div>
<br class="example-break"><p>
        As illustrated in the example above, <code class="code">Zend_Config</code> provides nested object property syntax to access
        configuration data passed to its constructor.
    </p>
<p>
        Along with the object oriented access to the data values, <code class="code">Zend_Config</code> also has <code class="code">get()</code>
        which will return the supplied default value if the data element doesn't exist. For example:
    </p>
<pre class="programlisting">&lt;?php
$host = $config-&gt;database-&gt;get('host', 'localhost');
    </pre>
<div class="example">
<a name="zend.config.introduction.example.file.php"></a><p class="title"><b>Example 5.2. Using Zend_Config with a PHP Configuration File</b></p>
<div class="example-contents">
<p>
            It is often desirable to use a pure PHP-based configuration file. The following code illustrates how easily
            this can be accomplished:
        </p>
<pre class="programlisting">&lt;?php
// config.php
return array(
    'webhost'  =&gt; 'www.example.com',
    'database' =&gt; array(
        'adapter' =&gt; 'pdo_mysql',
        'params'  =&gt; array(
            'host'     =&gt; 'db.example.com',
            'username' =&gt; 'dbuser',
            'password' =&gt; 'secret',
            'dbname'   =&gt; 'mydatabase'
        )
    )
);</pre>
<pre class="programlisting">&lt;?php
// Configuration consumption
require_once 'Zend/Config.php';
$config = new Zend_Config(require 'config.php');

// Print a configuration datum (results in 'www.example.com')
echo $config-&gt;webhost;</pre>
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